Combined socket and rheostat for radio use



lnvenTora William Rosenbhom Carl T Biume Aflyn- W. ROSENBLOOM ET AL COMBINED SOCKET AND RHEOST|T FOR RADIO USE Flled Aug 31 1922 May 26, 1925.

Ptentexi May 26 I925 WTCLiiLL-tll'i RQSENBLQQM Chi i UL I-BEZ'UME, F l'tEVY'EIEtE, MASESKQHUSETTE,

SQBZEINEB SOCKET AN EK-ADIQ Applicatiem fileai August, 33, 13%232. Scrial N0. $55,533.

To aZZ whom it nun?) concern:

Be it known that we, 11mm; Basins-- mom: mni CARL T. BLUE, citizens of the United States, and residents of Revere county of Suiiulli, titanic oi lylzissachuset!s have invcntcd an im 'n'm'cmcnt in $031k hinccl Sockets and llhccstais icy Radio Use, ofwhich ihc fcllowing description cannection with the accompanying di'mviiig', is 10 a .aipccificatti0nv like characters an the 6.1mm

rcpi'esenti mg like parts. This invention iltS fox its object to picvide a. combined sachet and rhccstat inmie as it singlc unit and adapted far use with radio apparatus of the type which vacuum valves in radio apparatus at this type it is custunmry to provide socket tc rec/hive the vzicimin tube, which time ticn either as it detectci' tube 01 as an am plifying tiihc and it is also cueatcmary to employ a i'heostiit in ccnncctinii with th tube and by which the resistance of the tubc-fiiamcnt circuit can he vzu'ctl.

Hcrctofcrc it has been the ccmmcn pr2icticc in make thc socket and the ihccstat as separate units, in which misc it is necessary to Wii'c up 886i] unit separately in mail ing the installation.

One object of our invention '5 to ppm vidc ccmhincti socket and filiGOSiZii) miidc as a single unit and which are prperly wired in the manufacture that the lififiO stat eicincn't is 'icrmancntly connected electricziliy with the socliiet clement. By using 535: this combined unit the instuilcticn cf the apparatus is simplifical lJ-BCPJESQ them is mil single iiiiit tc Wire up. Ai'iothcii cf cm invention zclzitca; to a novel cciicinciimi for thc combined 40 scclcct mid i'liccs'tut by which the socket clcmcnt is vczticaliy clisposccl so that the hulh thci'cin wili stand upright as usual in radio apparatus while the rhcostat is si rangeci about a horizontal axis. This arrangewent has the mlvzintage that when it is installed the control for the rhecstat will be situated in a most convenient position to n'mni miatc, while at the same time the bulb 01 tube will have the vcrticrii arrangement desirable.

Anothciadvantage incident to our. ii1- vcntion that the i'lmfisfltil control and the vacuum) tube always; have a fixcd. iclaticn tu each other with. the control closely ML jzicent to the socketomd thcici'ci'c, in using;

is 2m uniicir side a Sccticii on thc iinc 3--l, Fig. 2.

dQCiL iflQT'iil iliustictcci ccinprisesh has'c mci'iihc l having associated therewith it verticallyciispcscai scclzct cicmcnt 2 5 adapted t0 receive a vacuum hull), said s0ckct clement hcing shown as having a bayonet joint slot to rcceivc a pin c xtencling from thc of the bulb usual in apparatus of this type Stusih-zii hem h the 1. is a plate 4 iiisiiiating material which "farms the hottciii cf the sachet 21ml this piatc is proviilccl with fcuc 1pc ms 5 tc icccivc the 3 lieu; tctmiimls with which thc radio bulbs ilsllkliirgl provirlcct Sitiictcc beneath the pia-tc +1: are four contacts 6 7, 8 and i), which are in thefoi-m of resilient sri' c with which he hnih termincis cciitact when the bulb is inserted into the SOCl CBiZ. The contacts 7, 8 and 9 (TOIIHQCHKi to the hinding'posts 10, 11 and 12 respcctivcly the construction being such that these three contacts are insulated fmm thc base 1. Tha cchtacts 5i and 8 are thcsc W761i cormspcnd tc the grifi and plate contacts cf this: huh and t a ccntacts' 6 anti '2' iilGFiE; which cocrcs ml '50 the filament cmitacts of thchuih. 1 Q5 Th, i'hecstat is 0'? the usual form com? prising a core 0*? insulating matcrisii around which is Wound :1 ccil of resistance Wire and also ccmpiising a contact arm engaging thc coil anti turntable alomit an axis to vary the length of the resistance Wire which is in thc'circuit.

JLQG core at the li'lQOEttiQt element is shcwn at 13 and it has an arcuate' shape. Thc resistance wire which is coiled about thc core is indicated 14: and one 1 v cml 0i wiic is cmiiicctcci to a binding 120st 15m which the Cil'CllliI Wii'c is at iiflcih'fiw The Contact iii-in cf the rhccstat is inclicatcd at 1'6 and it ismcuntcd in a shaft 17 which carries in thumb piece or handle 18 by wh-ich the shaft may be turned. Said Qcontact arm is electrically connected to the the filament will be fromfthe terminal 15, through the: resistance Wire 14 to the contact arm,16, thence to the socket terminal 6, through the bulb and to the base terminal 10. By turning the shaft 17 and adjusting the contact 16 along the coil 1% the amount of resistance wire which is in the circuit can be varied thus varyingthe resistance of the circuit. In the present invention this rheostat is carried by the base and forms with the socket element a unit construction. The base is formed with the vertical Wall 19 which is provided with abearing 20 in which the shaft 17"is journa-lled and the 4 wall 19 is shown as having two wings 21 to 20 which the ends of the arcuate core 13 are secured. The shaft for operating the contact' arm is thus situated horizontally while the socket'is vertically disposed.

aAny permanent electrical connection be- 25. tween the contact arm 16 of the rheostat and the socket terminal 6 may be employed Without departing from the invention. It the base 1 is made of insulating material then the contact and terminal Wlll be connected by a suitable conductor which forms a permanent part of the unit and does not need to be disconnected from either element when the installation is made. On the other hand if the base 1 is'made of metal or a good conductor. of electricitythen the necessary electrical connection between the contact arm 16 and the socket terminal may be through the metal base. Where this construction is employed it will be sufiicicnt to 40 ground the socket terminal 6 on the base by means of a screw 22 as shown in Fig. 3, be-

sooket terminal 6 so that the circuit throughmenace cause the arm 16 is electrically connected to the base through the shaft 17.

One advantage of the above arrangement is that the unit may be placed on the hot tom of the casing; for the radio apparatus and secured thereto with the shaft 17 extending throughthe front panel 23 of said casing so that the thumb piece or knob 18 tive to each other wl'ierever they are mount-- ed on a panel or base and, therefore, the control which belongs to any bulb of the upparatus can be accurately determined.

lVe claim.

A combined socket and rhcostat for radio apparatus comprising a base having a vertical flange at one end, a vertically-disposcd socket element carried by the base and provided with socket terminals, an arcuate re sistance coil carried by said'vertical flange, a horizontal shaft journalled in and having electrical connection with said flange and a contact arm fast to said shaft and engaging said resistance coil, one of the socket terminals being grounded on the base.

In testimony whereof, we have signed our names to this specification.

WILLIAM nosENnLooM. CARL a. BLUME.

By mounting the 

